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5-4
Flow Chart of Troubleshooting and Circuit Diagram
Abnormal charging part
Y
N
Y
Check
the pin 17, 18 of CN603-1
is around 5V
Replace TA
N
Y
Check the pin 2 of U8021
is “Low”
Check the U201
using Factory Test Program
N
Y
Check the
pin 5, 6 of U8021 is more
than 0.5V
Resolder R648, R651, R646
N
Y
Check the
Voltage of pin 5 of
U605 is between 3.2 V
and 4.2 V
Change U605
END
5-4 SGH-A300 Charging Part
TA_PRES
TA_PRES
0
L602
PROG
3
VCC
5
VSENSE
R651
R634
Vext
Charger_Disable
Ta_Det
1
2
3
Vbat
3
1
U8021
2
5
6
3
1
Q601
R646
10UF
10V
0
22K
4
R637
3.3K,1%
C635
Q605
2
U605
DRIVE
6
GND
2
1
ISENSE
4
10V
10UF
C634
R648
10K